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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10949) Meta scan could hang
Date Thu, 10 Apr 2014 19:20:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965737#comment-13965737

Jimmy Xiang commented on HBASE-10949:

Looked into it and found StoreFileScanner#backwardSeek always returns true in some case. I
am testing a patch so that if seek() return false, don't return true.

> Meta scan could hang
> --------------------
>                 Key: HBASE-10949
>                 URL: https://issues.apache.org/jira/browse/HBASE-10949
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Blocker
>             Fix For: 0.99.0
>         Attachments: master-jstack.log
> When I play with ITBLL (from trunk tip), sometimes, meta scan hangs when the cluster
is rolling restarted. When this happens, the master takes about 1000% of CPU. It looks like
there is an infinite loop somewhere.  The logs show nothing interesting except some meta scanner
RPC calls timed out. Jstask shows the 10 high QoS RPC handlers are busy with meta scanning.
> However, if I run it again without HBASE-10018, things are fine. I suspect there is something
to do with the small/reverse scan.
> By the way, I see this problem even with log replay off and hfile version = 2.

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